CN115549351B

CN115549351B - Permanent magnet synchronous motor with anti-demagnetization function

Info

Publication number: CN115549351B
Application number: CN202211513152.2A
Authority: CN
Inventors: 王长路; 姬胜杰; 高贵彬; 薛晓麟; 曹建; 王远兵; 杨栋; 王晶
Original assignee: Jiangsu Zhonggong High End Equipment Research Institute Co ltd
Current assignee: Jiangsu Zhonggong High End Equipment Research Institute Co ltd
Priority date: 2022-11-30
Filing date: 2022-11-30
Publication date: 2023-04-07
Anticipated expiration: 2042-11-30
Also published as: CN115549351A

Abstract

The invention discloses a permanent magnet synchronous motor with an anti-demagnetization function, which comprises a motor shell, wherein a rotating shaft is rotatably arranged in the motor shell through a bearing, a rotor is fixedly welded outside the rotating shaft, an end cover is fixedly arranged on one side of the motor shell through a bolt, a heat exchanger is arranged on one side of the end cover, a cooling water pipe is correspondingly arranged on the outer wall of the heat exchanger in a penetrating manner, cold water is introduced into the cooling water pipe from top to bottom, a circular sleeve is movably sleeved outside the rotor, one side of the circular sleeve is closed and has no inner side wall, a hollow clamping ring is arranged on one side without the inner side wall in a laminating manner, one side of the hollow clamping ring is mutually communicated with the circular sleeve, one side of the hollow clamping ring is correspondingly and continuously connected with a water conveying thin pipe, one side of the circular sleeve is mutually clamped with the end cover to form shaft end positioning, and the two water conveying thin pipes extend outwards to the inside of the heat exchanger.

Description

Permanent magnet synchronous motor with anti-demagnetization function

Technical Field

The invention belongs to the technical field of motors, and particularly relates to a permanent magnet synchronous motor with an anti-demagnetization function.

Background

The permanent magnet synchronous motor is composed of a stator, a rotor, an end cover and the like. The stator is basically the same as a common induction motor, and a lamination structure is adopted to reduce iron loss during the operation of the motor. The rotor can be made into solid or laminated by lamination, and a permanent magnet is embedded in the rotor.

High temperature is one of the main causes of magnet demagnetization, and permanent magnets are prone to demagnetization when used in a high temperature environment. This means that PMSM need keep abundant heat dissipation, need shut down the cooling at an interval of time under the operating condition that does not possess special heat-radiating equipment, hinders operating efficiency, and current cooling method is through the air-cooled heat dissipation, can't directly dispel the heat to the rotor of the part that generates heat, and the radiating efficiency is low, causes the permanent magnet of rotor inside to lose magnetism easily, and the practicality is poor. This phenomenon becomes an urgent problem to be solved by those skilled in the art.

Disclosure of Invention

The invention aims to solve the problems in the prior art by aiming at a permanent magnet synchronous motor with an anti-demagnetization function of the conventional material collecting device.

In order to solve the technical problems, the invention provides the following technical scheme: the utility model provides a PMSM with prevent function of becoming magnetic, includes the motor casing, the pivot is installed through bearing rotation in the inside of motor casing, the outside of pivot has the rotor through welded fastening, there is the end cover one side of motor casing through the bolt fastening, the heat exchanger is installed to one side of end cover, the outer wall correspondence of heat exchanger link up and is provided with condenser tube, condenser tube's inside lets in cold water from top to bottom.

The invention further discloses that an annular sleeve is movably sleeved outside the rotor, one side of the annular sleeve is closed, the inner side wall is not arranged, one side without the inner side wall is provided with a hollow clamping ring in a fit mode, one side of the hollow clamping ring is communicated with the annular sleeve, one side of the hollow clamping ring is correspondingly communicated with a water conveying thin pipe, and one side of the annular sleeve is mutually clamped with an end cover to form shaft end positioning.

The invention further discloses that the two water transport thin pipes extend outwards to the inside of the heat exchanger, the end heads of the two water transport thin pipes are communicated with each other, one ends of the two water transport thin pipes form a U-shaped structure, and the gear pump is arranged on the upper water transport thin pipe in a communicated manner.

The invention further discloses that the hollow clamping ring is in an open shape, two ends of the opening are respectively communicated and connected with the water conveying tubule, a small side hole is formed in the communicated position, a blocking plate is fixed on the inner wall, far away from the opening, of the hollow clamping ring through welding, large side holes are correspondingly formed in the inner wall, located on two sides of the blocking plate, of the hollow clamping ring, and the large side holes are communicated and connected with the inner cavity of the annular sleeve.

The invention further discloses that an intermediate ring is fixedly arranged on the inner wall of the circular ring sleeve, square holes are uniformly formed in the intermediate ring, cylindrical rollers are rotatably arranged in the square holes through rolling needles, the outer walls of the cylindrical rollers are in contact with the outer wall of the rotating shaft, a separating part is fixedly arranged between the intermediate ring and the circular ring sleeve through insertion, the separating part divides the inner space of the circular ring sleeve into an upper cavity and a lower cavity, and one side of the separating part is in sliding contact with the outer wall of the rotating shaft.

The invention further discloses that a water inlet channel and a water outlet channel are symmetrically arranged in the rotating shaft, the water inlet channel and the water outlet channel are communicated with the outer wall of the rotating shaft respectively, the communicated part is positioned in the inner space of the annular sleeve, and the communicated positions of the water inlet channel and the water outlet channel and the rotating shaft form an L-shaped structure.

The invention further discloses that a first valve ball is movably arranged in the water inlet channel and is contacted with the through positions of the water inlet channel and the rotating shaft, a first spring is connected between the inner wall of the water inlet channel and the first valve ball, a second valve ball is movably arranged in the water outlet channel and is contacted with the inner wall of the L-shaped structure corner of the water outlet channel, and a second spring is connected between the inner wall of the L-shaped structure corner of the water outlet channel and the second valve ball.

The invention further discloses that cooling channels are uniformly distributed on the circumference in the rotor, all the cooling channels are converged in the rotor, one half of the cooling channels are communicated with the water inlet channel, and the other half of the cooling channels are communicated with the water outlet channel.

Compared with the prior art, the invention has the following beneficial effects: the invention carries out the following modification: the rotor is internally provided with a plurality of cooling flow channels, the rotation of the rotor drives the cooling medium inside to flow, so that the heat of the permanent magnet in the rotor is taken away, the permanent magnet inside the rotor is prevented from being demagnetized under the high-temperature running state for a long time, and the sealing problem of the cooling flow channels under the condition of high-speed rotation is solved; meanwhile, the inlet and the outlet of the cooling flow channel are integrated, water flow does not need to be introduced from two ends for heat exchange, the volume of a cooling part is saved, and the cooling flow channel is convenient to disassemble and assemble; and through repacking the bearing, can cool off the hookup location of countershaft and casing in the lump, stability when promoting to rotate.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the internal structure of the heat exchanger of the present invention;

FIG. 3 is a schematic view of the rotor mounting of the present invention;

FIG. 4 is a schematic view of the installation of the hollow snap ring and the annular sleeve of the present invention;

FIG. 5 is a schematic cross-sectional view of a hollow snap ring of the present invention;

FIG. 6 is a schematic view of the internal structure of the torus cover of the present invention;

FIG. 7 is a schematic view of the installation of the first and second valve balls of the present invention;

FIG. 8 is a schematic view of the internal cross-sectional configuration of the rotor of the present invention;

FIG. 9 is a schematic flow diagram of the cooling tunnel of the present invention;

in the figure: 1. a motor casing; 2. a heat exchanger; 3. a cooling water pipe; 21. a first guide plate; 22. a second guide plate; 4. a water conveying thin pipe; 41. a gear pump; 5. a hollow snap ring; 6. a circular ring sleeve; 7. a rotor; 71. a rotating shaft; 51. a projection; 52. a square block; 53. a double-ended screw; 54. a rotating part; 55. a seal ring; 72. a water inlet channel; 73. a water outlet channel; 56. a small side hole; 57. a large side hole; 58. a barrier plate; 61. a partition portion; 62. an intermediate ring; 63. a cylindrical roller; 74. a first valve ball; 75. a first spring; 76. a second valve ball; 77. a second spring; 78. and a cooling channel.

Detailed Description

The following detailed description of the present invention, taken in conjunction with the preferred embodiments and the accompanying drawings, further illustrates the present invention without limitation. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-9, the present invention provides a technical solution: a permanent magnet synchronous motor with an anti-demagnetization function comprises a motor shell 1, wherein a rotating shaft 71 is rotatably arranged in the motor shell 1 through a bearing, a rotor 7 is fixedly welded outside the rotating shaft 71, an end cover is fixedly arranged on one side of the motor shell 1 through a bolt, a heat exchanger 2 is arranged on one side of the end cover, a cooling water pipe 3 is correspondingly arranged on the outer wall of the heat exchanger 2 in a penetrating manner, cold water is introduced into the cooling water pipe 3 from top to bottom, when the permanent magnet synchronous motor is used, water flowing through the cooling water pipe 3 supplies water into the heat exchanger 2, and the motor shell 1 is radiated through the heat exchanger 2 to form a primary radiating effect;

the outer part of the rotor 7 is movably sleeved with a circular sleeve 6, one side of the circular sleeve 6 is sealed, one side of the circular sleeve 6 is free of an inner side wall, a hollow clamping ring 5 is attached to one side without the inner side wall, one side of the hollow clamping ring 5 is communicated with the circular sleeve 6, one side of the hollow clamping ring 5 is correspondingly communicated with a water conveying tubule 4, one side of the circular sleeve 6 is clamped with an end cover to form shaft end positioning, water discharged from the circular sleeve 6 is conveyed into the water conveying tubule 4 through the hollow clamping ring 5 and is cooled by a heat exchanger 2, the connection position of a shaft and the motor shell 1 is conveniently subjected to targeted heat dissipation, and the influence of thermal expansion and cold contraction on the stable operation of the rotor 7 due to friction is effectively relieved;

the two water conveying thin pipes 4 extend outwards to the inside of the heat exchanger 2, the ends of the two water conveying thin pipes 4 are communicated with each other, one ends of the two water conveying thin pipes 4 form a U-shaped structure, the water conveying thin pipe 4 positioned above the U-shaped structure is provided with a gear pump 41 in a through mode, when the water conveying thin pipe cooling device is used, the gear pump 41 is started, water of the water conveying thin pipes 4 is conveyed, and water flow cooled from top to bottom is pumped into the hollow clamping ring 5 again for circulating cooling;

the hollow clamping ring 5 is in an open shape, two ends of the opening are respectively communicated with the water conveying tubules 4, small side holes 56 are formed in the communicated position, a blocking plate 58 is fixed on the inner wall, far away from the opening, of the hollow clamping ring 5 through welding, large side holes 57 are correspondingly formed in the inner wall of the hollow clamping ring 5, located on two sides of the blocking plate 58, the large side holes 57 are communicated with the inner cavity of the circular sleeve 6, when the hollow clamping ring is used, water pumped into the hollow clamping ring 5 from the upper water conveying tubule 4 enters the large side holes 57 and then is converged into the circular sleeve 6, the rotatably connected part is cooled, the circulated water enters the large side holes 57 on the lower side from the circular sleeve 6 and then is converged into the hollow clamping ring 5 again until the water conveying tubules 4 on the lower side are discharged, and orderly cooling liquid circulation is formed;

the inner wall of the circular ring sleeve 6 is fixedly provided with a middle ring 62, the middle ring 62 is uniformly provided with square holes, cylindrical rollers 63 are rotatably arranged in the square holes through roller pins, the outer wall of each cylindrical roller 63 is in contact with the outer wall of the rotating shaft 71, a separating part 61 is fixedly inserted between the middle ring 62 and the circular ring sleeve 6, the separating part 61 divides the inner space of the circular ring sleeve 6 into an upper cavity and a lower cavity, one side of the separating part 61 is in sliding contact with the outer wall of the rotating shaft 71, when the rotor runs, the position of the middle ring 62 is fixed due to the fixed position of the circular ring sleeve 6, the outer wall of the rotating shaft 71 is enabled to be attached to and rotate with the side walls of the cylindrical rollers 63 along with the rotation of the rotating shaft 71, the smooth high-speed rotation of the rotating shaft 71 is kept, the whole cylindrical rollers 63 are soaked in cooling liquid to form effective cooling, the problem of unstable running of the rotor 7 caused by friction and thermal expansion of the contact surface of the rotating shaft 71 and the cylindrical rollers 63 is prevented, the separating part 61 is used for isolating the introduced cooling water and the discharged warm water, and cold-contraction flow phenomenon is prevented;

a water inlet channel 72 and a water outlet channel 73 are symmetrically formed in the rotating shaft 71, the water inlet channel 72 and the water outlet channel 73 are communicated with the outer wall of the rotating shaft 71 respectively, the communicated position is located in the inner space of the annular sleeve 6, the communicated position of the water inlet channel 72, the water outlet channel 73 and the rotating shaft 71 forms an L-shaped structure, water flow which is converged into the annular sleeve 6 enters the water inlet channel 72 from the cavity of the annular sleeve 6 above to cool the inside of the rotating shaft 71, is circularly discharged to the water outlet channel 73 and then discharged from the cavity of the annular sleeve 6 below to form circulation of cooling liquid, and the cooling of the rotating shaft 71 and the cooling of the cylindrical roller 63 in the annular sleeve 6 are integrated into one flow channel, so that the cooling is more sufficient;

when the rotating shaft 71 rotates to the upper cavity of the annular sleeve 6, because the pressure from the inside to the outside exists above (relative to the water inlet channel 72 in the rotating shaft 71), the first valve ball 74 cannot be squeezed open, the water inlet channel 72 cannot circulate liquid, and similarly when the rotating shaft 71 rotates to the upper cavity of the annular sleeve 6, the pressure of the liquid in the upper cavity of the annular sleeve 71 is kept to be in the upper cavity of the annular sleeve 71, the liquid in the lower cavity of the annular sleeve 76 can be drained, and the liquid in the annular sleeve 71 can be drained to the inside of the annular sleeve 76, and the liquid in the annular sleeve 71 can be drained to the outside, so that the liquid in the annular sleeve 71 can be drained to the outside, and the liquid in the annular sleeve 71 can be drained to the outside;

the inside of rotor 7 evenly is the circumference and has seted up cooling channel 78, and each cooling channel 78 collects in the inside of rotor 7 mutually, half cooling channel 78 link up with inlet channel 72 mutually, and half cooling channel 78 link up with outlet channel 73 mutually, the rivers that get into from inlet channel 72 can divide into a plurality of strands and collect into cooling channel 78, and form the cooling to the rotor inside, cooling effect from inside to outside is more thorough in pure air-cooled cooling, and cooling channel 78 gathers the back at the inside of rotor 7 and scatters again, collect until outlet channel 73 department, be convenient for form one-way entry and export, the integrated level of cooling structure is higher.

Example 1: as shown in fig. 2, in order to improve the cooling effect of the cooling water inside the heat exchanger 2, a first guide plate 21 and a second guide plate 22 are obliquely arranged on the inner wall of the heat exchanger 2, the first guide plate 21 divides the bent structure of the water transport tubule 4 into two parts, the right end of the first guide plate 21 contacts with the inner wall of the heat exchanger 2, the left end of the first guide plate 21 has a gap with the inner wall of the heat exchanger 2, the second guide plate 22 divides the space between the inner wall of the bottom of the heat exchanger 2 and the water transport tubule 4 into two parts, the left end of the second guide plate 22 contacts with the inner wall of the heat exchanger 2, the right end of the second guide plate 22 has a gap with the inner wall of the heat exchanger 2, after the cooling water is introduced, the cooling water first contacts with the tubule 4 pipeline section of the gear pump 41, at this time, the water is hottest and is cooled by contacting with the coldest water just introduced into the heat exchanger 2, so as to achieve the best cooling effect, the water flows between the first guide plate 21 and the second guide plate 22 through the first guide plate, and then flows into the cavity below, so as to form the most specific cooling mode, no turbulent flow is formed inside the heat exchanger 2, the flow of the cooling water, the flow of the first cooling water is discharged, and the second cooling water is discharged, and the best cooling effect.

Example 2: as shown in fig. 4, in order to improve the running stability of the rotor 7 when cooling water is introduced, the opening is fixed with the protruding portions 51 by welding, one side of each of the two protruding portions 51 is respectively fixed with the square blocks 52 by welding, screw holes are formed in the two square blocks 52, the screw holes are internally connected with the double-threaded screws 53 by threads, the two ends of each of the double-threaded screws 53 are fixed with the rotating portions 54 by welding, when the tightness of the hollow clamping ring 5 in clamping connection with the rotating shaft 71 needs to be adjusted, the rotating portions 54 are rotated by hands, the double-threaded screws 53 can be rotated and the tightness of the hollow clamping ring 5 can be adjusted by thread transmission, the inner wall of the hollow clamping ring 5 and the rotating shaft 71 form fit with moderate tightness, the running stability of the rotating shaft 71 is maintained, when the rotating shaft is disassembled, firstly, the end cover of the motor is disassembled, the circular sleeve 6 can smoothly slide after losing axial positioning, the double-threaded screws 53 reversely rotate to enable the hollow clamping ring 5 to loosen the rotating shaft 71, at this time, the water-transporting tubule 4 can be pulled to drive the hollow clamping ring 5 and the circular sleeve 6, and the whole cooling structure can be conveniently disassembled.

In embodiment 3, as shown in fig. 4, in order to prevent the cooling water from flowing out from the gap between the rotating shaft 71 and the hollow snap ring 5, a sealing ring 55 is fixed on the inner ring side wall of the hollow snap ring 5 by bonding, a lubricating coating is coated on the inner wall of the sealing ring 55, and the sealing ring 55 is made of a highly wear-resistant rubber material and has certain elasticity, and can be filled in the gap between the hollow snap ring 5 and the rotating shaft 71 to prevent the cooling water from flowing out.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description of the present invention, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Finally, it should be pointed out that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions may be made in some technical features thereof, without departing from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides a permanent magnet synchronous motor with prevent function of becoming lost magnetic, includes motor casing (1), its characterized in that: a rotating shaft (71) is rotatably installed inside the motor casing (1) through a bearing, a rotor (7) is fixedly welded outside the rotating shaft (71), an end cover is fixed on one side of the motor casing (1) through a bolt, a heat exchanger (2) is installed on one side of the end cover, a cooling water pipe (3) is correspondingly arranged on the outer wall of the heat exchanger (2) in a penetrating mode, and cold water is introduced into the cooling water pipe (3) from top to bottom;

a circular ring sleeve (6) is movably sleeved outside the rotor (7), one side of the circular ring sleeve (6) is closed, no inner side wall exists on one side, a hollow clamping ring (5) is attached to one side without the inner side wall, one side of the hollow clamping ring (5) is communicated with the circular ring sleeve (6), one side of the hollow clamping ring (5) is correspondingly communicated with a water conveying thin pipe (4), and one side of the circular ring sleeve (6) is clamped with an end cover to form shaft end positioning;

the two water conveying thin pipes (4) extend outwards to the inside of the heat exchanger (2), the ends of the two water conveying thin pipes (4) are communicated with each other, one ends of the two water conveying thin pipes (4) form a U-shaped structure, and the water conveying thin pipes (4) positioned above the two water conveying thin pipes are provided with gear pumps (41) in a through mode;

hollow joint ring (5) are the opening form, and open-ended both ends respectively with fortune water tubule (4) through connection, and link up the department and seted up little side opening (56), hollow joint ring (5) are kept away from the open-ended inner wall and are had baffler (58) through welded fastening, are located big side opening (57) have been seted up in cavity joint ring (5) inner wall correspondence of baffler (58) both sides, big side opening (57) and the mutual through connection of the inside cavity of ring cover (6).

2. The permanent magnet synchronous motor with the anti-demagnetization function according to claim 1, characterized in that: the inner wall of the circular ring sleeve (6) is fixedly provided with a middle ring (62), square holes are uniformly formed in the middle ring (62), cylindrical rollers (63) are rotatably arranged in the square holes through roller pins, the outer walls of the cylindrical rollers (63) are in contact with the outer wall of the rotating shaft (71), a separating part (61) is fixedly arranged between the middle ring (62) and the circular ring sleeve (6) through insertion, the inner space of the circular ring sleeve (6) is divided into an upper cavity and a lower cavity by the separating part (61), and one side of the separating part (61) is in sliding contact with the outer wall of the rotating shaft (71).

3. The permanent magnet synchronous motor with the anti-demagnetization function according to claim 2, characterized in that: the water inlet channel (72) and the water outlet channel (73) are symmetrically arranged in the rotating shaft (71), the water inlet channel (72) and the water outlet channel (73) are communicated with the outer wall of the rotating shaft (71) respectively, the communicated position is located in the inner space of the circular ring sleeve (6), and the communicated positions of the water inlet channel (72) and the water outlet channel (73) and the rotating shaft (71) form an L-shaped structure.

4. A permanent magnet synchronous motor having an anti-demagnetization function according to claim 3, characterized in that: the inside activity of inlet channel (72) is provided with valve ball (74), and valve ball (74) contacts with the through position of inlet channel (72) and pivot (71), be connected with spring (75) between the inner wall of inlet channel (72) and valve ball (74), the inside activity of outlet channel (73) is provided with valve ball two (76), and valve ball two (76) contact with the L type structure corner inner wall of outlet channel (73), be connected with spring two (77) between the L type structure corner inner wall of outlet channel (73) and valve ball two (76).

5. The permanent magnet synchronous motor with the anti-demagnetization function according to claim 4, characterized in that: the inside of rotor (7) evenly is the circumference and has seted up cooling channel (78), and each cooling channel (78) collects mutually in the inside of rotor (7), half cooling channel (78) link up with inlet channel (72) mutually, and half cooling channel (78) link up with outlet channel (73) mutually.